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Ida Kirkegaard, Olav Bjørn Petersen, Niels Uldbjerg and Niels Tørring Improved performance of first-trimester combined screening for trisomy 21 with the double test taken before a gestational age of 10 weeks Prenatal Diagnosis 28

Article first published online: 1 AUG 2008 | DOI: 10.1002/pd.2057

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